Seems like a proper place to me!

There should be a "BannerGeneratorData.plist" in the following path: ~/Library/WeatherCatData. You might try Quitting WC, moving that plist to your Desktop, and Restart WC. WC should now create a new, blank/default BannerGeneratorData.plist for you. Hope that helps.
Now,
if you're like me, make a copy of the new BannerGeneratorData.plist, while still in the above path. Now, the next time you "screw up" the plist, you'll already have a copy of the default, ready to go!
![Lol [lol]](https://athena.trixology.com/Smileys/default/lol-1.gif)